//===-- ValueObjectSyntheticFilter.h ----------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#ifndef liblldb_ValueObjectSyntheticFilter_h_
#define liblldb_ValueObjectSyntheticFilter_h_

// C Includes
// C++ Includes
#include <memory>

// Other libraries and framework includes
// Project includes
#include "lldb/Core/ThreadSafeSTLMap.h"
#include "lldb/Core/ValueObject.h"

namespace lldb_private {

//----------------------------------------------------------------------
// A ValueObject that obtains its children from some source other than
// real information
// This is currently used to implement Python-based children and filters
// but you can bind it to any source of synthetic information and have
// it behave accordingly
//----------------------------------------------------------------------
class ValueObjectSynthetic : public ValueObject
{
public:
    ~ValueObjectSynthetic() override;

    uint64_t
    GetByteSize() override;
    
    ConstString
    GetTypeName() override;
    
    ConstString
    GetQualifiedTypeName() override;
    
    ConstString
    GetDisplayTypeName() override;

    bool
    MightHaveChildren() override;

    size_t
    CalculateNumChildren(uint32_t max) override;

    lldb::ValueType
    GetValueType() const override;
    
    lldb::ValueObjectSP
    GetChildAtIndex(size_t idx, bool can_create) override;
    
    lldb::ValueObjectSP
    GetChildMemberWithName(const ConstString &name, bool can_create) override;
    
    size_t
    GetIndexOfChildWithName(const ConstString &name) override;

    lldb::ValueObjectSP
    GetDynamicValue(lldb::DynamicValueType valueType) override;
    
    bool
    IsInScope() override;
    
    bool
    HasSyntheticValue() override
    {
        return false;
    }
    
    bool
    IsSynthetic() override
    {
        return true;
    }
    
    bool
    IsBaseClass () override
    {
        if (m_parent)
            return m_parent->IsBaseClass();
        return false;
    }

    void
    CalculateSyntheticValue(bool use_synthetic) override
    {
    }
    
    bool
    IsDynamic() override
    {
        return ((m_parent != nullptr) ? m_parent->IsDynamic() : false);
    }
    
    lldb::ValueObjectSP
    GetStaticValue() override
    {
        return ((m_parent != nullptr) ? m_parent->GetStaticValue() : GetSP());
    }
    
    virtual lldb::DynamicValueType
    GetDynamicValueType ()
    {
        return ((m_parent != nullptr) ? m_parent->GetDynamicValueType() : lldb::eNoDynamicValues);
    }

    ValueObject *
    GetParent() override
    {
        return ((m_parent != nullptr) ? m_parent->GetParent() : nullptr);
    }

    const ValueObject *
    GetParent() const override
    {
        return ((m_parent != nullptr) ? m_parent->GetParent() : nullptr);
    }
    
    lldb::ValueObjectSP
    GetNonSyntheticValue() override;
    
    bool
    CanProvideValue() override;
    
    bool
    DoesProvideSyntheticValue() override
    {
        return (UpdateValueIfNeeded(), m_provides_value == eLazyBoolYes);
    }
    
    lldb::ValueObjectSP
    GetSyntheticChildAtOffset(uint32_t offset,
                              const CompilerType& type,
                              bool can_create,
                              ConstString name = ConstString()) override
    {
        if (m_parent)
            return m_parent->GetSyntheticChildAtOffset(offset,
                                                       type,
                                                       can_create,
                                                       name);
        return nullptr;
    }

    bool
    GetIsConstant () const override
    {
        return false;
    }
    
    bool
    SetValueFromCString(const char *value_str, Error& error) override;
    
    void
    SetFormat(lldb::Format format) override;
    
    lldb::LanguageType
    GetPreferredDisplayLanguage() override;
    
    void
    SetPreferredDisplayLanguage (lldb::LanguageType);
    
    bool
    GetDeclaration(Declaration &decl) override;

    uint64_t
    GetLanguageFlags () override;
    
    void
    SetLanguageFlags (uint64_t flags) override;
    
protected:
    bool
    UpdateValue() override;
    
    LazyBool
    CanUpdateWithInvalidExecutionContext() override
    {
        return eLazyBoolYes;
    }
    
    CompilerType
    GetCompilerTypeImpl() override;
    
    virtual void
    CreateSynthFilter ();

    // we need to hold on to the SyntheticChildren because someone might delete the type binding while we are alive
    lldb::SyntheticChildrenSP m_synth_sp;
    std::unique_ptr<SyntheticChildrenFrontEnd> m_synth_filter_ap;
    
    typedef ThreadSafeSTLMap<uint32_t, ValueObject*> ByIndexMap;
    typedef ThreadSafeSTLMap<const char*, uint32_t> NameToIndexMap;
    
    typedef ByIndexMap::iterator ByIndexIterator;
    typedef NameToIndexMap::iterator NameToIndexIterator;

    ByIndexMap      m_children_byindex;
    NameToIndexMap  m_name_toindex;
    uint32_t        m_synthetic_children_count; // FIXME use the ValueObject's ChildrenManager instead of a special purpose solution
    
    ConstString     m_parent_type_name;

    LazyBool        m_might_have_children;
    
    LazyBool        m_provides_value;
    
private:
    friend class ValueObject;
    ValueObjectSynthetic (ValueObject &parent, lldb::SyntheticChildrenSP filter);
    
    void
    CopyValueData (ValueObject *source);
    
    DISALLOW_COPY_AND_ASSIGN (ValueObjectSynthetic);
};

} // namespace lldb_private

#endif // liblldb_ValueObjectSyntheticFilter_h_
